OK, I need to get the basics and identify my stuff. This is my first PDP-ish system and I am feeling quite overwhelmed at this point. Thanks to "the experts" so far for all of your patience; I'll try to catch up as quickly as possible... Part of the problem is that this is *not* DEC stuff. It is Plessey Peripherals. Of which I have been able to find *no* info regarding part numbers and to equate them with their respective DEC equivalents. Maybe someone could help me clear some of this up? The main cabinet has the backplane and two Shugart 801 (SS, DD @ 1 meg *each* right?) drives in it. Now, from what I've read, this should be a pretty close copy of a PDP-11/23, right? What do I refer to these drives as? The backplane is a 9x6 Qbus. It has a KDF-11 (M8186) CPU and a bunch of boards that no one can ID from their numbers, including memory cards, a Peritek video card, a Standard Memories ram card with a toggle switch, a 4-port serial card, a floppy controller, and a multifunction board with 4 serial ports and a floppy connector. This floppy connector connects to another cabinet which houses 2 Mitsubishi 2996 8" drives, which I have found the specifications to indicate they're DS-DD @ 1.6 megs each. Confirmation? What do I refer to these drives as? There were a couple of people on the alt.sys.pdp newsgroup who remember something about the Plessey's, and I'm in the process of following up with them. Thanks again for the patience; maybe once I know what the hell I've got, I'll be better equipped to ask questions... Thanks again for everyone's patience and all the help I've gotten already. Aaron